Figures of the Article

• Accuracy of six machine learning models on the peridot training set and testing set
• Map of the origins of the peridot samples from Damaping, Hebei Province and Yiqisong, Jilin Province, China and Changyon District, DPRK
• Some double-sided polished peridot samples from Damaping, Hebei Province
• Faceted samples from the three origins (left three samples: Damaping, Hebei Province; middle three samples: Yiqisong, Jilin Province; right three samples: Changyon District, DPRK)
• Gaussian kernel density estimation on 16 elements of peridot samples from the three origins
• Accuracy of LDA model obtained by combining different elements
• Average improvement rates for each element in different combinations of element quantities
• Sum of average improvement rates for individual element
• Ideal boundary and LDA boundary for a binary classification problem in 2D space